If you are saying that the Switch will be supported for a long-time, I certainly agree. It won't be dropped like the N64, GCN, Wii (drop relative to how successful it was, it wasn't dropped as quickly as the others I'm mentioning) and Wii U. Even the 3DS which couldn't quite manage half of the DS sales still is available in some stores and has not been officially discontinued yet after 9 years. Though that day is coming any moment now since all models but the 2DS and 2DS XL were discontinued last year and first-party support ended.
But if you're implying that we will probably wait until 2025 or 2026 for the Switch's successor, I very much disagree. I know Nintendo gave up on hardware parity long ago. And the Switch is a hybrid that does not directly compete with Xbox and PlayStation, but it is still a competitor. Even a Switch Pro upgrade between 2021-2023 wouldn't be enough to keep up consumer interest all the way until 2025-2026. A new platform creates interest, and to compete in entertainment Nintendo needs to strike while the iron is hot. I think the Switch's successor will probably come out in 2023, maybe 2024 at the latest.
Lifetime Sales Predictions
Switch: 151 million (was 73, then 96, then 113 million, then 125 million, then 144 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 57 million (was 60 million, then 67 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
